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BSBattery Spec Notes

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  1. kW versus kWh: power and energy on a battery spec sheet

    Why a battery label shows both kW and kWh, what each one measures, and how to read the two numbers together without mixing them up.

  2. Usable versus total capacity on a battery label

    Why usable capacity sits below the headline number on a battery label, what causes the gap, and which figure to use when you plan.

  3. Depth of discharge explained

    What depth of discharge means on a battery spec sheet, the two ways it's defined, and how it links to usable capacity and cycle life.

  4. Round-trip efficiency: what is lost between charging and using

    What a round-trip efficiency percentage on a battery spec sheet means, where the missing energy goes, and how to apply the figure to your own numbers.

  5. Continuous power rating: what the kW figure limits

    What a continuous output rating limits on a home battery, how it differs from peak power and from capacity, and how to check it against your loads.

  6. Volts, amp-hours and watt-hours: converting between them

    How to turn a battery's voltage and amp-hour label into watt-hours, so you can compare two batteries on the same scale, and where the sum falls short.

  7. Reading a battery warranty: years, cycles and throughput

    What battery warranty terms such as years, cycles, throughput and end-of-warranty capacity say, and what to look for in the maker's own warranty document.